1147results about How to "Improve mechanical stability" patented technology

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention belongs to the technical field of emulsified asphalt materials, and particularly relates to an emulsified asphalt mixture and a preparation method thereof.The emulsified asphalt mixture is prepared from 95-98 parts of aggregate, 3-5 parts of early strength agent, 0-2 parts of water, 0-3 parts of mineral powder and 10-11 parts of modified emulsified asphalt, the modified asphalt is obtained by compounding and modifying SBS, petroleum resin and rubber powder. Through step-by-step preparation, the mixture has good emulsifying performance and can emulsify SBS and rubber powder, SBS, petroleum resin and rubber powder are organically combined, the mixture has good performance, meanwhile, the early strength agent is used, the early strength agent and modified emulsified asphalt can play a synergistic effect, the performance of the mixture is further improved, and the service life of the mixture is prolonged. All performance indexes of the emulsified asphalt mixture reach or even exceed those of a hot-mix asphalt mixture, and the emulsified asphalt mixture can be applied to a surface layer of an asphalt pavement and has very high actual use value.

The invention discloses a preparation method of a wear-regenerated super-hydrophobic durable anti-corrosion coating. The preparation method comprises the following steps: constructing a mechanical-sturdy super-hydrophobic coating with body phase consistency through reverse filling of a self-similar structure; wherein the oily binder solution is subjected to phase separation under the action of an alcohol solvent, is mixed with the fluorinated nanoparticles and is sprayed on the surface of a metal matrix to construct a self-similar super-hydrophobic coating, and a uniform dispersion liquid of the low-surface-energy nanoparticles and the high-hardness oily binder is sprayed on the surface of the self-similar super-hydrophobic coating; particularly, the self-similar structure of the super-hydrophobic coating can be effectively filled with the high-hardness oily binder due to the good oil absorbency of the oily binder, and finally the wear-regeneration durable super-hydrophobic anti-corrosion coating is formed; the wear regeneration durable super-hydrophobic anti-corrosion coating prepared by the method not only has excellent super-hydrophobicity, mechanical stability, chemical stability and anti-corrosion performance, but also has the advantages of special mechanical wear regeneration super-hydrophobicity and the like.

The invention relates to a multi-layer nickel net catalytic electrode for hydrogen production by alkaline electrolysis of water and a preparation method of the multi-layer nickel net catalytic electrode. The multi-layer catalytic electrode comprises multiple layers of nickel nets with different mesh numbers, and the multiple layers of nickel nets are sequentially stacked according to the mesh numbers from large to small and are sintered and formed to form the multi-layer nickel net catalytic electrode with the dense inside and the sparse outside. The preparation method comprises the following steps: sequentially stacking nickel nets with different mesh numbers according to the mesh number from large to small, and sintering; and then a raw material belt is flatly laid on the outer surface of the first layer of nickel net, stamping and electro-deposition are carried out, polishing is carried out after electro-deposition, rapid sintering is carried out, and the multi-layer catalytic electrode is obtained. Compared with the prior art, the catalytic electrode disclosed by the invention is of a structure with three layers of nickel nets which are dense inside and sparse outside, and the three layers of nickel nets are slightly melted and adhered together at high temperature to form an integral structure by adopting a vacuum sintering process, so that not only is the binding force among the nickel nets enhanced, but also the characteristics of each layer of nickel net are retained; the defects of a single-layer nickel net in the aspects of catalyst loading, mass transfer performance and mechanical strength are effectively overcome.

The invention relates to a polymer coated graphite negative electrode material and a preparation method and application thereof, the preparation method comprises the following steps: mixing polyacrylonitrile and graphite by adopting a ball milling method, then treating by adopting a liquid phase coating method to coat the surface of the graphite with a layer of polyacrylonitrile, and then carrying out low-temperature heat treatment to obtain the cyclized polyacrylonitrile coated graphite negative electrode material. The compact, flexible, high-electron and high-ion conductive coating is constructed on the surface of the graphite, so that the mechanical stability and the chemical stability of the graphite negative electrode material are effectively enhanced, the problem that a coating material is easy to break and fall off in a long-cycle process in the prior art is avoided, the interface performance of a graphite negative electrode and an electrolyte is improved, and the service life of the graphite negative electrode is prolonged. The volume expansion of the graphite negative electrode material is inhibited, the electrochemical activity of the graphite negative electrode material is enhanced, the electron transmission rate is accelerated, the rate capability and the cycle performance of the graphite negative electrode are further improved, and the preparation process is simple, green and environment-friendly, and is beneficial to industrial production and application.

The invention discloses a preparation method of a reverse osmosis membrane and the reverse osmosis membrane. The preparation method comprises the following steps: (1) adding polyethersulfone into N, N-dimethylacetamide in a heating and stirring state, and stirring for a period of time after charging is completed, so as to obtain a mixed solution; (2) cooling the mixed solution, continuing to add a pore-foaming agent, and stirring for a period of time after charging is completed to obtain a precursor solution; (3) performing vacuum defoaming treatment on the precursor solution to obtain a membrane casting solution; (4) loading the membrane casting solution on a carrier, and then carrying out gel bath treatment to obtain a base membrane; and (5) performing polyamide treatment on the surface of the base membrane to obtain the reverse osmosis membrane. The preparation method disclosed by the invention is simple in process and low in material cost, and the obtained reverse osmosis membrane has more uniform and more through-type pore structures, higher separation efficiency, more excellent chemical stability and better mechanical properties, can adapt to higher operation pressure, and can continuously and stably operate at higher flux under high pressure.

The invention discloses an anti-ultraviolet ozone treatment silver nanowire composite transparent electrode and a preparation method thereof. The method comprises the following steps: firstly, coating a layer of silver nanowires on a transparent substrate, taking the silver nanowires as a cathode, taking a mixed aqueous solution of zinc nitrate and aluminum nitrate as an electrolyte, electrically depositing an aluminum-doped zinc oxide (AZO) protective layer on the silver nanowires, then coating a layer of stannic oxide nanocrystals (SnO2), and finally, carrying out electrodeposition on the transparent substrate. And carrying out heat treatment to obtain the silver nanowire composite transparent electrode subjected to anti-ultraviolet ozone treatment. The oxidation resistance and mechanical stability of the silver nanowire transparent conductive thin film can be remarkably improved, meanwhile, the excellent flexibility, conductivity and light transmission of the silver nanowire transparent conductive thin film are kept, the protection process of the silver nanowire is simplified, and the silver nanowire transparent conductive thin film has potential application in the field of flexible electronics.

The invention relates to the technical field of bipolar plates of all-vanadium redox flow batteries, in particular to a modified binary composite bipolar plate for a vanadium battery and a preparation method of the modified binary composite bipolar plate. Performing interface crosslinking on the carbon-coated graphite and the cationic polyelectrolyte under the action of an enhanced silane coupling agent to obtain a pasty filler, and performing primary melt mixing on the resin and a polymer additive in a solvent to obtain the carbon-coated graphite composite material. And carrying out secondary melting on the pasty filler, the compatilizer and the primary mixing product, and carrying out integral compression molding on final mixing particles by using a hot press to obtain the modified binary composite bipolar plate. According to the bipolar plate prepared by the invention, chitosan film coated carbon nanotubes and carbon coated graphite are subjected to interface crosslinking to form a continuous conductive grid, and the conductivity and mechanical strength of the bipolar plate can be effectively improved, so that the efficiency of an all-vanadium redox flow battery stack is improved.

The invention relates to the field of mortar, and discloses environment-friendly waste tire particle modified premixed mortar and a preparation method thereof. The environment-friendly waste tire particle modified premixed mortar is prepared from the following raw materials in parts by weight: 350 to 420 parts of cement, 100 to 150 parts of fly ash, 150 to 220 parts of modified waste tire particles, 10 to 25 parts of modified carbon nanotubes, 500 to 700 parts of fine aggregate, 4 to 7 parts of a water reducing agent, 15 to 20 parts of an early strength agent, 2 to 5 parts of a photoinitiator, 1 to 3 parts of a defoaming agent, 0.4 to 1 part of a thickening agent and 190 to 275 parts of deionized water. The modified waste tire particles are obtained by introducing a plurality of crosslinking sites on the surfaces of the waste tire particles by utilizing semi-closed isophorone diisocyanate; the modified carbon nanotubes are prepared by forming polydopamine through in-situ auto-polymerization of dopamine, then performing in-situ growth of nano silicon dioxide and further introducing fluorine-containing long chains and sulfydryl groups, and the mortar is endowed with excellent mechanical strength and impermeability by adding the modified waste tire particles and the modified carbon nanotubes.

The invention provides a quick-charge and quick-discharge type lithium battery and a preparation method thereof, and belongs to the technical field of lithium battery preparation. The preparation process comprises the following steps: preparing a fluorinated carbon nanotube based on biomass carbon; preparing a positive electrode plate; preparing the dendritic mesoporous silicon dioxide nano particles; preparing a cerium oxide-loaded two-dimensional hierarchical porous composite material; preparing a negative electrode plate; and assembling the lithium battery. According to the preparation method, the eutectic and the carbon fluoride nanotubes are added in the preparation of the positive electrode plate, and the cerium oxide-loaded two-dimensional hierarchical porous composite material and the carbon fluoride nanotubes are added in the preparation of the negative electrode plate, so that the prepared positive electrode plate and the prepared negative electrode plate have relatively high conductivity; and moreover, the ion transmission efficiency is improved, the rapid ion transmission is beneficial to reducing the polarization phenomenon of the battery, improving the charging and discharging rate and the power performance of the battery, enhancing the structural stability of the electrode, improving the performance and the safety of the battery, and being more beneficial to rapid charging and rapid discharging.

The invention relates to the field of shielding materials, and provides lead-free rubber with ionizing radiation shielding performance and a preparation method thereof, and the lead-free rubber is mainly prepared from barium titanate / boron nitride composite filler, barium tungstate / boron carbide composite filler, tungsten powder, bismuth powder, a rubber matrix and an auxiliary agent according to a proportion. The barium titanate particles are uniformly loaded on the surface of the flaky boron nitride, so that the gamma ray and X ray shielding performance is improved, and meanwhile, the boron nitride provides excellent neutron shielding capability; barium tungstate particles are loaded on the surfaces of the boron carbide nanowires to form a multi-scale shielding network, and the shielding effect of neutrons and ionizing radiation is remarkably enhanced. The rubber matrix endows the material with excellent flexibility and mechanical properties. By scientifically optimizing the component proportion and the preparation process, the problems that a traditional high-density shielding material is prone to agglomeration, poor in flexibility and the like are solved, and the material shows excellent performance in the fields of gamma ray, X ray and neutron shielding and is suitable for the fields of nuclear energy, medical protection, industrial radiation protection and the like.

The invention provides a hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium, a preparation method of the hydrogen production electrode and a water electrolysis hydrogen production device, and relates to the field of water electrolysis hydrogen production. The preparation method of the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium comprises the following steps: coating the surface of a conductive substrate with mixed powder; the conductive base material coated with the mixed powder is subjected to thermal oxidation treatment, the mixed powder comprises first metal powder, second metal powder and a pore forming agent, the first metal powder comprises Ni powder, and the second metal powder comprises Pt powder, Ru powder, Sn powder and Pr powder; and putting the structure subjected to thermal oxidation treatment into an alkaline solution, and activating to obtain the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium. The platinum, the ruthenium, the tin and the praseodymium are introduced into the hydrogen production electrode, so that the hydrogen evolution overpotential can be reduced. The hydrogen production electrode prepared by the method disclosed by the invention has relatively high catalytic activity, relatively high stability and a uniformly distributed porous structure, the electrolytic efficiency can be remarkably improved, and the service life of equipment is prolonged.

The invention discloses an embedded liquid metal microstructure electrode, a flexible pressure sensor array and a preparation method. The technical problems that an existing flexible pressure sensor array is low in sensitivity, large in crosstalk and the like are solved. Wherein the embedded liquid metal microstructure electrode comprises a first flexible substrate, a first liquid metal layer and a first packaging layer; the lower surface of the first flexible substrate is a plane, and a plurality of micro-cone structures arranged in an array are uniformly distributed on the upper surface of the first flexible substrate; the cone part of each micro-cone structure faces upwards and is flush with the upper surface of the first flexible substrate; the first liquid metal layer covers the upper surface of the first flexible substrate and all the micro-cone structures; the first packaging layer covers one surface, far away from the upper surface of the first flexible substrate, of the first liquid metal layer; meanwhile, the invention further provides a preparation method of the microstructure electrode, a flexible pressure sensor array based on the microstructure electrode and a preparation method of the flexible pressure sensor array, and the flexible pressure sensor array is high in sensitivity and low in crosstalk.

The invention discloses a photonic integrated circuit chip and a silicon optical integration platform, and aims to provide a specific waveguide structure on the photonic integrated circuit chip to realize efficient coupling with a common single-mode fiber, and meanwhile, a suspended structure is not introduced, so that the overall structure has relatively high mechanical stability. The method can pass high-temperature and high-humidity reliability test conditions of the photon integrated circuit chip, and is compatible with reflow soldering, silicon through hole and other processes.

The invention is suitable for a high polymer material technology, and discloses a preparation method of a PLA / PBAT composite material and the PLA / PBAT composite material prepared by the method. The preparation method of the PLA / PBAT composite material comprises the following steps: mixing PBAT, an initiator and a cross-linking agent to obtain a first mixture; the first mixture is subjected to melt extrusion in an extruder, and pre-crosslinked PBAT granules are obtained; pLA and the PBAT granules are mixed, and a second mixture is obtained; the second mixture is subjected to melt extrusion in the extruder, and the PLA / PBAT composite material is obtained. The PLA / PBAT composite material prepared by the preparation method provided by the invention is good in mechanical stability and relatively good in tensile strength and rigidity.

The invention provides a porous carbon skeleton silicon-based negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) modifying nano silicon on the surface of low-softening-point asphalt: stirring and dispersing nano silicon and low-softening-point asphalt into an organic solvent, uniformly mixing, distilling to remove the solvent, drying, and carrying out pre-oxidation treatment to obtain lipophilic nano silicon; (2) fully blending the obtained lipophilic nano silicon, fused salt and high-softening-point mesophase pitch at a high temperature, and performing crushing granulation, primary carbonization, washing and drying to obtain a primary silicon-carbon precursor of which the nano silicon is embedded in a porous carbon matrix; and (3) performing high-temperature solid-phase coating on the primary silicon-carbon precursor by using high-softening-point coating asphalt powder to obtain a secondary silicon-carbon precursor, and performing secondary carbonization to obtain the porous carbon skeleton silicon-based negative electrode material with multi-level buffering, the inner core is a porous carbon skeleton, and the outer layer is a compact carbon coating. The silicon-based negative electrode material with a porous carbon skeleton is ingeniously designed from three kinds of asphalt derived carbon, a silicon volume expansion space, an ion electron channel and expansion stress intensity are provided, the specific capacity, the conductivity and the mechanical stability of the silicon-carbon negative electrode material can be improved, and the silicon-carbon negative electrode material has excellent electrochemical performance when being used for a lithium ion battery.

The invention discloses a phase change fiber membrane with a composite core-sheath structure and a preparation method and application thereof.The method comprises the steps that polyacrylonitrile is dissolved in N 'N-dimethylformamide and stirred to be completely dissolved, then hydroxylated boron nitride is added, the hydroxylated boron nitride is evenly dispersed through ultrasonic treatment, and a sheath spinning precursor solution is prepared; dissolving polyethylene glycol in N 'N-dimethylformamide, stirring to melt the polyethylene glycol, and taking the polyethylene glycol as a core layer spinning precursor solution; preparing a phase change fiber membrane with a core-sheath structure from the sheath spinning precursor solution and the core spinning precursor solution through a coaxial electrostatic spinning process; and placing the phase change fiber membrane with the core-sheath structure in an ethanol dispersion liquid of hydroxylated boron nitride, carrying out ultrasonic dip-coating, and then carrying out cold pressing treatment to prepare the phase change fiber membrane with the composite core-sheath structure. The obtained composite core-sheath structure phase change fiber membrane has good latent heat property, thermal conductivity and flexibility, and meanwhile, leakage of the phase change material is prevented through the core-sheath structure.

The invention provides an asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane and a preparation method and application thereof, the preparation method comprises the following steps: (1) under a heating condition, mixing surface hydroxylated silicon dioxide particles and paraffin, adding a first solvent, stirring, and cooling to obtain paraffin emulsion droplets; (2) mixing the paraffin emulsion droplets obtained in the step (1) with a sulfydryl-containing silane coupling agent, and reacting to obtain a mixture; and mixing the mixture with a hydrogen peroxide solution, and carrying out oxidation reaction to obtain the asymmetrically modified silicon dioxide particles, and (3) mixing the asymmetrically modified silicon dioxide particles and sulfonated polyetheretherketone, and drying to obtain the asymmetrically modified silicon dioxide particle doped sulfonated polyetheretherketone membrane. The asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane provided by the invention is low in swelling property, relatively high in proton conductivity and relatively good in ion selectivity, and the performance of a flow battery can be improved when the membrane is used for the flow battery.

The invention provides an Mxene-iron molybdenum bimetallic sulfide and carbon composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and is used for solving the technical problems of poor conductivity and rate capability of a metal sulfide negative electrode material. The preparation method of the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material comprises the following steps: dissolving an iron source, a molybdenum source and a carbon source in a solvent to prepare a mixed solution; then carrying out a hydrothermal reaction to prepare a bimetallic oxide nanosphere; the bimetallic oxide nanospheres are subjected to high-temperature vulcanization treatment, and iron-molybdenum bimetallic sulfide carbon is prepared; the preparation method comprises the following steps: mixing Mxene and iron-molybdenum bimetallic sulfide and carbon through ball milling to prepare the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material. The composite material disclosed by the invention can realize efficient electron transmission and provide more active sites, and is beneficial to the electrochemical reaction of the battery; the mechanical stability of the material can be enhanced, the volume expansion in the charging and discharging process is effectively reduced, the particle diffusion path between positive and negative electrodes is shortened, and the reaction kinetics of the electrode is improved; and the conductivity and the rate capability of the material can be effectively improved, so that the comprehensive performance of the sodium-ion battery is improved.

The invention belongs to the technical field of compressed air energy storage, and discloses a salt cavern compressed air energy storage reservoir stability grade evaluation method and system, and the method comprises the steps: obtaining salt rock physical and mechanical parameters, stratum structure parameters and salt cavern internal structure parameters; selecting a stability evaluation index of the salt-cavern compressed air energy storage library; establishing a three-dimensional geomechanical model of the salt cavern energy storage library and performing simulation calculation; constructing an evaluation model; determining an index weight value of the stability of the salt-cavern compressed air energy storage library; calculating an evaluation grade; and adjusting and optimizing operation parameters of the salt cavern energy storage bank. According to the method, by providing a systematic quantitative analysis process and a unified evaluation index system, the accuracy and reliability of stability evaluation of the salt-cavern compressed air energy storage library are remarkably improved, and an important technical support is provided for development and application of a salt-cavern compressed air energy storage technology. Important technical support is provided for development and application of a salt cavern compressed air energy storage technology, and commercialization and large-scale development of the technology can be promoted.

The invention discloses an integrated optical diversity receiving device, solves the problem of high power consumption when the influence caused by phase distortion and light beam pointing error is corrected in the existing free space optical communication, and belongs to the field of optical communication. The method comprises the steps that free space light focused by a lens is received by a multimode / few-mode optical fiber; the multi-mode light beams received by the multimode / few-mode optical fiber enter the photon lantern; the photon lantern is coupled to the single-mode fiber array after mode demultiplexing; each light beam in the single-mode fiber array enters a polarization beam splitting rotary combiner through an edge coupler; the polarization beam splitting rotation combiner performs transverse electric wave (TE) and transverse magnetic wave (TM) mode separation on the entered light beam, then rotates the separated TM polarization state light to a TE polarization state, combines the rotated TE polarization state light and the separated TE polarization state light, and then enters the MZI network; the MZI network is used for realizing optical coherent beam combination; a control circuit controls the merging of the light beams in the MZI network.

The invention discloses a carboxyl-containing Troger base and a preparation method of an anion exchange membrane of the carboxyl-containing Troger base, and relates to the technical field of ion exchange membrane preparation. The preparation method of the anion exchange membrane containing the carboxyl comprises the following steps: synthesizing a Troger base containing the carboxyl, synthesizing a polybenzimidazole polymer containing the Troger base, synthesizing an anion exchange membrane polymer containing the Troger base, and preparing the compact anion exchange membrane containing the Troger base. Compared with the prior art, the preparation method has the advantages that the carboxyl-containing Troger base is synthesized through the reaction of specific aminomethyl benzoic acid and dimethoxymethane and by using trifluoroacetic acid as a solvent and a catalyst, so that the purity and the stability of a product are improved, the carboxyl-containing Troger base is more effectively introduced into a polybenzimidazole polymer, and the polybenzimidazole polymer is prepared. The porosity of the polybenzimidazole polymer is improved, so that the electrochemical performance and the mechanical stability of the anion exchange membrane are improved.

The invention belongs to the technical field of biosensing instant detection, and relates to DAAO / HRP-MAF-7 hydrogel as well as a preparation method and application thereof. The hydrogel is formed by immobilizing horse radish peroxidase (HRP) and D-amino acid oxidase (DAAO) in a hydrophilic metal organic framework MAF-7, and then loading the prepared DAAO / HRP-MAF-7 biological composite material and a color developing agent TMB in PEG-DA hydrogel together. The DAAO / HRP-MAF-7 hydrogel can be used as a biosensor to be applied to detection of D-amino acid.

The invention provides a large bulb tubular pump device capable of inhibiting a tail vortex structure, which comprises a bulb body positioned in a bulb body runner and a flow guide pier positioned in a water outlet runner, the flow guide pier is positioned behind the bulb body, one end of the flow guide pier extends to the outline of the tail of the bulb body, and the other end of the flow guide pier extends to the tail of the bulb body. The flow loss between the flow guide pier and the tail of the bulb body is reduced. The extension line of the outline of the tail of the bulb body is tangent to the thickness of the flow guide pier and used for restraining generation of tail vortexes. The tail portion of the bulb body is fused with the flow guide pier, an effective supporting structure is provided for the lengthened bulb body, the mechanical strength and stability of the whole device are enhanced, the reasonable design of the flow guide pier ensures that no obvious local flow loss is generated when fluid passes through the area, and the flow guide pier is more stable. Meanwhile, the durability of the equipment is improved.

The invention discloses a solid electrolyte membrane and a preparation method, the solid electrolyte membrane comprises an electrolyte material, an ionic conductive binder and a polymer, the ionic conductive binder comprises a binder and a lithium salt, and the polymer is obtained by in-situ polymerization of a polymer monomer in a membrane forming process. The polymer and the conductive ion binder can fill gaps of electrolyte particles, so that the flexibility of the solid electrolyte membrane is improved, and the solid electrolyte membrane can bear higher pressure; and an ion transmission channel can be shortened, so that the ionic conductivity of the solid electrolyte membrane is improved.

The invention discloses an invisible appliance based on a transparent piezoelectric film and a design method thereof. A perioral muscle pressure sensor is installed on the lip / cheek lingual surface of teeth of the invisible orthodontic appliance, an occlusal force sensor is installed on the occlusal surface, and a tooth surface counter-acting force sensor is installed on the inner side tissue surface, so that dynamic changes of perioral muscle pressure, occlusal force and orthodontic force can be monitored in real time. The invisible orthodontic appliance provided by the invention integrates a sensor with high piezoelectric coefficient and high flexibility, has high sensitivity and accuracy, can be used for testing dynamic changes of orthodontic mechanics and evaluating the influence of perioral muscle pressure, occlusal force and the like on treatment during physiological processes of chewing, breathing, swallowing, language and the like of a patient; a doctor optimizes an orthodontic scheme through the PC terminal and pays attention to the association between oral functional mechanics and malocclusion, bad oral habits, bruxism, temporomandibular joint disorder and other diseases, and the efficiency and accuracy of oral health management are improved.

The invention discloses a preparation method and application of biomass-based photo-thermal super-hydrophobic composite aerogel, and belongs to the technical field of oil spill adsorption materials. The method comprises the following steps: (1) mixing sodium alginate, kapok fibers and water to obtain a dispersion; freeze-drying is carried out, such that kapok / sodium alginate composite aerogel is obtained; (2) soaking the kapok / sodium alginate composite aerogel in a CaCl2 aqueous solution for cross-linking, so as to obtain cross-linked composite aerogel; (3) soaking the cross-linked composite aerogel in an aqueous solution containing Tris-HCl and dopamine hydrochloride, so as to obtain a polydopamine composite aerogel; (4) soaking in a pyrrole aqueous solution, and adding anhydrous FeCl3 to obtain photo-thermal composite aerogel; and (5) carrying out hydrophobic modification on the photo-thermal composite aerogel through organosilane vapor deposition to obtain the biomass-based photo-thermal super-hydrophobic composite aerogel. The super-hydrophobic composite aerogel prepared by the method has excellent adsorption performance and photo-thermal performance, and can quickly remove oil stains in water.

The invention discloses a sample adjusting device for a microbiological detection analyzer, and relates to the technical field of microbiological detection analysis, the sample adjusting device comprises a device main body, an inner cavity of the device main body is fixedly connected with a fixing plate, the fixing plate is fixedly connected with a servo motor, an output shaft of the servo motor is fixedly connected with a rotating disc, and the rotating disc is fixedly connected with a rotating shaft of the rotating disc. A crank is rotationally connected to the rotating disc, a loading table is rotationally connected to the end, away from the rotating disc, of the crank, a guide rail is fixedly connected to an inner cavity of the device body, and a first sample tube and a second sample tube are arranged on the loading table; in the process that the test tube moves to the position below the first sample tube and the second sample tube, a piston rod of a piston barrel moves, detection liquid in a liquid storage barrel is dropped into the test tube, meanwhile, the dropping quantity of the detection liquid can be adjusted and controlled, errors caused by different persons in manual operation are avoided, and the detection accuracy is improved. In addition, direct contact between operators and reagents and samples is reduced in the automatic process, and the risks of cross contamination and environmental pollution are avoided.

The invention belongs to the field of hydrogen production by alkaline electrolyzed water, and particularly relates to a double-functional-group alkaline electrolyzed water composite diaphragm as well as a preparation method and application thereof. The preparation method of the double-functional-group alkaline electrolyzed water composite diaphragm comprises the following steps: S1, mixing nano ceramic particles with a modification liquid, and performing a modification reaction to obtain amino and sulfydryl double-functional-group modified nano ceramic particles, wherein the modification liquid contains an amino silane coupling agent and a sulfydryl silane coupling agent; the polymer supporting layer is placed in sulfonation liquid to be subjected to sulfonation modification reaction, and then a sulfonated polymer supporting layer is obtained; and S3, mixing the bifunctional group modified nano ceramic particles, a polymer, a pore forming agent and a first organic solvent to obtain a membrane casting solution, degassing the membrane casting solution, coating a sulfonated polymer supporting layer with the membrane casting solution to form a membrane, and performing phase inversion in a coagulating bath to obtain the bifunctional group alkaline electrolyzed water composite membrane. The double-functional-group alkaline electrolyzed water composite diaphragm provided by the invention is good in mechanical property, stable in performance, low in surface resistance and good in air tightness.

The invention discloses a flame-retardant modified PVC (polyvinyl chloride) composite material based on graphene-coated hydroxyl magnesium-aluminum hydrotalcite LDHs (layered double hydroxides) and a preparation method of the flame-retardant modified PVC composite material. The method comprises the following steps: S1, preparing hydrotalcite-based filler based on graphene-coated hydroxyl magnesium-aluminum hydrotalcite LDHs: S1-1, preparing graphene oxide GO; s1-2, preparing reduced graphene oxide r-GO; s1-3, preparing a hydrotalcite-based filler by a one-pot method; s2, loading a flame retardant on the hydrotalcite-based filler through an impregnation method to obtain a flame-retardant modified filler; s3, coating the flame-retardant modified filler with a polymer to obtain a composite modified filler; s4, mixing the composite modified filler, a stabilizer, a plasticizer and PVC to obtain the flame-retardant modified PVC composite material. The PVC composite material provided by the invention has excellent mechanical strength and thermal stability, and also has excellent flame retardant property and smoke suppression effect.